Hydroglider



Feb; 19, 1924. 1,483,931

F. DUMOND ET AL HYDROGLIDER Filed Oct. 5, 1921 2 Sheets-Sheet 1 I Feb. 1,1924. 1,483,931

- F, DUMOND ET AL HYDROGLIDE R Fi led Oct. 5, 1921 2 sheets-sheet 2 Vikiwow? fiaWJl/WZ Z Ww Y Patented Feb. 19, 1924.

UNITED ST FnnNoIsQ E DUMOND AND CLEMENT GALYIN, or LYON, rnnnon.

HYDROGLIDER.

Application filed October 5, 1921. Serial No. 505,522.

To all whom it may concern:

Be it known that we, FRANOISQUE DU- MOND, of Lyon, and CLEMENT GALVIN,of Lyon, France, citizens of the French Republic, have invented certainnew and use ful Improvements in Hydrogliders, of which the following isa specification.

The present invention relates to improvements in hydro-gliders, for thepurpose of avoiding suction of the water, and to ensure the stability ofthe hull whilst increasing the gliding properties of the deviceparticularly when navigatin on rough water.

These results are obtamed by the shape and proportions given to the hullof which the lower face is provided with a slight set-back and is incommunication with the atmosphere by air conduits the lower orifices ofwhich are immediately behind said setback.

In order to give the device sufiioient rig-' idity the hull is providedwith two longitudinal carlines forming an undistortable beam capable ofresisting the combined pressures of water and air at any rate of speed.

The annexed drawing illustrates an example of'construction of theimproved hy dro-glider.

Figs. 1 and 1 are longitudinal sections thereof on line 11 of Fig. 2.

Fig. 2 a cross section on line 2--2 of Fig. 1 and Figs. 3 and 3 planviews.

Fig. 4 is a section on line 44 of Fig. 1.

The keel or hull comprises :1. A front part A-B of which the noseforming the bow of the vessel is only immersed when travelling overwaves, if there are any, and acts to throw them sideways. This part ABextends more than a third of the whole length of the hull and itsinclination in relation to the line of flotation is at an angle of fromtwo to five degrees.

2.-Two gliding surfaces a one on each side of the vessel built in withthe part AB above the line of flotation and acting as a bearing surfacein all stages of progress from starting to full speed, when it onlydirects the streams of water downwards.

3. A rear surface B-G rising slightly from B to C in relation to theline of flotation, so that the molecules of water sliding downwardsresume their equilibrium by producing a natural wave above the staticlevelof-the said surfacea The length BC is s'uch that the hull receivesthe reaction" from bottom to top of this wave, which reaction dressesthe vessel during motion as otherwise it would have a tendency to sinkat the stern. This unusual lengthenin of the rear part B-C ensureslongitu inal stability of travel and allows the employ ment of efficientrudders of which one all is immersed in the water and one or two otherse act in the air. In practice, it is advisable for the length 13-0 to beat least equal to twenty-five times the depth of immersion of the hullfrom the line of flotation at B.

The bottom of the hull has, in a transverse plane passing through B, aslight set-back b about five millimetres in height, immediately behindwhich are the orifices of two conduits 0 communicating at their upperends with the atmosphere. Air is thus conveyed beneath the hull atatmospheric pressure, for the sole purpose of avoiding suction of thewater, which without such provision would be produced behind the setback 6. The slight height given to the setback 6 is just suflicient tocause the streams of'water to lose adherence with the surface of thehull behind the set-back and which is in communication with theatmosphere in the manner described. This set-back therefore performs afunction uite different from the very accentuated setacks hithertoprovided in certain hydro-gliders.

Owing to the arrangement of this slight set-back b and the airconducting conduits 0 great facility of gliding is obtained, even i withthe wind ahead and in rough water and also a distinct improvement in thelongitudinal stability of the vessel is obtained, any suction evenpartial such as might occur when tacking or at meeting cross currents,being prevented by this arrangement.

In order to give the hydro-glider the necessary rigidity, its hull isprovided with two carlines 7 supported and strengthened by tie-beams 72,these carlines being extended upwards as at g. o

The hydro-glider is completed by an air propeller i and by the necessaryaccessories which do not enter into the scope of the present invention.a

What we claim as our'inventionand desire to secure by Letters Patent ofthe United States is In a hydro-glider, a hull having a front partforming the bow thereof and a rear part of rectangular shape in plan andof a length considerably greater than said front part the base of saidfront part being upwardly inclined towards the bow from two to fivedegrees with respect to the horizontal and the base of the rear partbeing upwardly inclined towards'the stern of said hull to a lesserdegree than the base of said front part a single transverse set back ofslight depth extending along the line of intersection of said front andrear parts said line of intersection being in front of the centre ofgravity of the hull two hydro-planing surfaces one on each side of saidfront part, conduits the upper ends of which are in communication withthe atmosphere and the lower outlets are immediately behind said setback and an aerial propeller for driving the hydroglider.

In witness whereof we have signed this specification in the presence oftwo witnesses.

FRANCISQUE DUMOND. CLEMENT GALVIN.

1 Witnesses:

JULIAN GAMBLE S-WEBERG, GUILLAUME PIOCHE.

